Elecs Industry Co., Ltd.

Noriyuki Kawaguchi

Kensuke Ozeki

Kenichi Harada

Tadashi Takano

Takashi Maeda

Yuichi Chikahiro

Kenji Ema

Provided is an AD converter that is capable of converting a wideband noise signal of several GHz or more into a digital signal and that can be used even when an installation space and power supply are severely limited. The AD converter includes: a comparator () configured to compare an input voltage of an analog signal to a determination voltage; an adjustment unit () configured to shift at least one of the input voltage of the analog signal or the determination voltage; an encoder () configured to output time-series data of one bit based on a result of the comparison obtained by the comparator; a processing unit () configured to calculate a frequency of appearance of an output code included in the time-series data; and a control unit () configured to cause the adjustment unit to operate so that a result of the calculation obtained by the processing unit becomes a predetermined value.

AD converter, power measurement device for wideband noise using same, and power spectrum measurement device

Provided is a method of calibrating a microwave radiometer, which eliminates use of liquid nitrogen as a calibration source. The method is applied to a microwave radiometer configured to receive, by a receiver having a primary radiator connected thereto, a radio wave emitted from an object to be measured depending on a temperature of the object to be measured and to measure a brightness temperature of the object to be measured from an output signal of the receiver. In the method, the method a noise temperature Tof the receiver appearing on an output side of the receiver is calibrated by observing a plurality of calibration sources having known brightness temperatures. The method includes using a radio wave reflector configured to totally reflect noise radiated from an input side of the receiver as one of the plurality of calibration sources.

Method for calibrating microwave radiometer

Growing community of inventors

Tokyo, Japan

Noriyuki Kawaguchi